Ocanic pH is currentlu 8.03, aragonite and magnesium starts to dissolver at pH8.04. Under RCP8.5 Oceanic pH will be 7.95 by 2045 and most of the aragonie and magnesium calcite will have dissolved. Given that more than 50% of all marine life depends upon these minerals, do you not expect a trophic cascade collapse of the entire marine system, and is this not a much greater threat to the planet and humanity than climate change.